Message-ID: <473DB52F.2040703@zytor.com>
Date: Fri, 16 Nov 2007 07:20:15 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Andreas Herrmann <aherrman@arcor.de>
CC: Sam Ravnborg <sam@ravnborg.org>, linux-kbuild@vger.kernel.org,
       linux-kernel@vger.kernel.org
Subject: Re: Kconfig: ARCH=x86 causes wrong utsname.machine
References: <20071116111446.GA16968@devil> <20071116123747.GA12086@devil>
In-Reply-To: <20071116123747.GA12086@devil>
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Andreas Herrmann wrote:
> The new ARCH=x86 kernel build causes weired machine strings on 32-bit.
> For a cross-compiled kernel I have
> 
> 	 $ uname -m
> 	 x66_64
> 
> For a kernel natively built on a 32 bit machine I have
> 
> 	$ uname -m  
> 	x66
> 
> Looking at the sources, I think that utsname->machine was initially
> set as "x86_64" and "x86", respectively.
> But in arch/x86/kernel/cpu/bugs.c in check_bugs() the second character
> is set to '6' on my K7.
> 
> I think the right solution for that problem is to use "x86_64" as the
> machine name for 64-bit and to keep the old "i[3456]86" strings for
> 32-bit kernels.

Absolutely.  This would be userspace-visible ABI breakage.

	-hpa
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